body {
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
}

footer {
    background-color: #eee;
    color: #333;
    padding: 20px;
    clear: both;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: calc(100vh - 140px); /* Calcula la altura de la ventana menos el espacio del header y footer */
}

.centered {
    width: 300px;
    height: auto;
    border: 1px solid black;
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
}

.centered label {
    display: block;
    text-align: left;
}

.centered input[type="text"],
.centered input[type="password"] {
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 10px;
    padding: 5px;
}

.centered input[type="submit"] {
    width: 100%;
    padding: 10px;
    color: white;
    border: none;
    cursor: pointer;
}

.error {
    text-align: center;
}